Chuck mechanism for automatic cutting-machines.



` No. 663,255. Patented im. 4, 19Go.

J. w.- nowu, 1n. A CHUCK MECHNISM` FCR AUTOMATIC CUTTING` MACHINES.

(Application med Nov. 23, 1899.|

2 Sheets-Sheet I.

No Model.)

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J. w. Bnuwmh. CHUCK MECHANISM FCR AUTUMATIC CUTTING MACHINES.

(Application led Nov. 23, 1899.;

2 Sheets-Sheet 2,

`(No Model.)

mi Nonms Firms co, moro-uma, WASHINGTON. n. c,

lNiTED ,STATES PATENT Ormes.

JOI-IN WILSON BROVN, JR., OF PHILADELPHIA,PENNSYLVANIA- CHUCKMECHANISIVI FOR AUTOMATIC CUTTING-MACHINES.

SPECIFICATION forming part of Letters Patent N0. 663,255, dated December4 1900 Application filed November 23, 1899. Serial No. 738,104. (Nomodel.)

To nell whom, t may concern.'

2e it known that I, JOHN WILSON BROWN, Jr., a citizen of the UnitedStates, residing in Philadelphia, Pennsylvania, have invented certainImprovements in Chuck MechanismV In the accompanying drawings, Figure lis a longitudinal sectional view illustrating my improved chuckmechanism for automatic cutting-machines with the chuck in the releasedposition. Fig. 2 is a view of a .portion of Fig. 1, showing thechuck-levers in the position when the chuck is closed. Fig. 3 is an endview of Fig. 1, and Fig. 4 is a View Of a modification.

I have not shown the full frame of an automatic cutting-machine, as Ican apply my inventiop to the ordinary type ofmachine, using turretmechanism for feeding the cutters and a cam wheel or bar for operatingthe chuck mechanism ,and a driven spindle, although in some instancesthe spindle may be stationary and the tool may revolve.l

A is the frame of the machine, having bearings t a for the hollowrspindle B. This frame has an extension A', and adapted to guideways onthis extension is a slide C, which has a pin c, with which engagecam-plates c on a cam-wheel C', mounted in bearings in the frame of themachine and driven in any suitable manner.

The hollow spindle B has a head b. The opening in the spindle is flared,as clearly shown, and adapted to this flared portion of the spindle is aconical head d of a tubular clutch-bar D, split at its outer end andhav-- ing a recess d for the reception of the article to be cut. Bydrawing the clutch-bar into the spindle .thetapered head d will travelon the tapered portion of the spindle, which will cause the chuckportion to contract and bind upon the article to be clutched, thusholding the article rigidly, as the split portions of the clutch-barcannot. yield, being backed bythe solid spindle. When the clutch ismoved in the opposite direction, the split portions are free of thespindle and the spring ofthe metal 'will cause the head to enlarge andrelease the article.

The spindle B has a tubular extension B', which is slotted at b' for therecept-ion of the lugs d2 d2 on the rear end of the clutch-bar D.Screwed onto the extension B in the present instance is a ring B2 towhich are pivoted at e levers E E, the short arm of each lever restingin front of the lugs d2 of the clutch-bar and the long arm of each leverresting in such position as to be actuated by a sleeve, as describedhereinafter. Within the extension B is a spring F, which tends to forcethe clutchbar forward, so that the jaws will open as soon as the bar isreleased by the levers. Surrounding the extension B' is a sleeve G,having a flange g at its forward end, and on the rear end of the sleeveis a nut g. Adapted to the'sleeve is a sliding collar G, and betweenthis collar and the liange g of the sleeve is a heavy spring H. Engagingwith the collar G' is a segmental arm c2, carried by the slide O.

The end of the sleeve Gr is tapered, the portion z' of the taper beingabrupt and the portion z" being very slight. I preferably make this endof the sleeve of hard metal, and in the present instance I use twohard-metal blocks set in the sleeve.

The operation of the clutch mechanism is as follows: The article is fedinto the space d' of the jaws of the clutch-bar by any suitableautomatic mechanism or by hand. The cam C moves the slide C forward, andthis slide being connected to the collar G moves it forward, and thismotion is imparted to the sleeve G through the spring H, causing thetapered portion of the sleeve to pass under the long arms of the leversE, and as the arms move out the clutclrbar is drawn back by the shortarms of the levers engaging the lugs cl2, and the article to be cut isclamped by the closing in of the jaws. As the motion of the sleevecontinues the long arms of the levers ride upon the portion i" of thesleeve, which is slightly tapered. Consequently additional IOO pressureis brought to bear upon the clutch and the articleclam ped. As theconnections between -the levers and the article clamped are rigid, thelimit of pressure will be reached during the travel forward of thesleeve, and the balance of the movement of the collar G and slide C willbe compensated for by the spring H, so that when the piecesdifferslightly in diameter the clampwill exert apparently the same pressureupon them, and the balance of the movement will be taken up by thespring. The taper of the portion 7l is such that the friction will holdthe sleeve and prevent it backing off when the pressure on the spring isreleased until the collar G strikes the nut g on the rear portion of thesleeve, causing the sleeve to be forcibly pulled away from the levers.

In Fig. 4 I have shown a modification-of my invention in which thelevers E are in the form of cams bearing against lugs on the rear of theclutch-bar, the long arm of each lever being in position to be actedupon by the sleeve.

It will-be understood that in casting a large number of pieces of thesame shape there will be a slight variation in the size of a piece, dueto several causes, and heretofore it has been difficult to provide aclutch that will hold the piece rigidly and yet will compensate for thedifference in diameter of the pieces.

I cla-im as my inventionl. rlhe combination of a tubularspindle, achuck-bar adapted thereto, means for drawing the chuck-bar into thespindle to close the same, operating mechanism, and a spring woundaround said spindle mounted between the operating mechanism and thelevers for drawing in the chuck-bar, substantially as described.

2. The combination of a spindle, a chuckbar mounted therein, one or morelevers acting to draw the chuck-bar into the spindle to close the same,a sliding collar having a tapered portion, operating` mechanism, asecondcollar sliding on the first adapted to engage said operating mechanismand a spring wound on thefirst collar and operating between the baradapted thereto, one or more levers engaging the chuck-bar, a sleevehaving a double tapered portion over which one arm of the lever travels,one tapered portion being abrupt and the other less than the angle ofrepose, and means for moving thesleeve so that the levers will beengaged first by the abrupt incline of the sleeve and then by the slightincline, on which latter they will remain during the time that the chuckis in the closed position, substantially as described.

4. The combination of a spindle, a chuckbar adapted thereto, one or morepivoted levers, one arm of each lever engaging the chuck-bar, a sleeveadapted to come in contact with the other arm. of each lever, saidsleeve having an abrupt tapered portion and a slight tapered portion, aspring back of the sleeve, and operating mechanism bearing against thespring, substantially as described.

`5. The combination of a spindle, a chuckbar adapted thereto, having aflange at its rear end, one or more pivoted levers engaging the flange,a sleeve having two tapered portions atone end, one more abrupt than theother, and having at the opposite end a flange, a collar adapted toslide upon the sleeve, a spring mounted between 'the collar and theliange on the forward end of the sleeve so that the pressure exerted toclose the chuck will be through the spring, the colla-r striking therear Harige of the sleeve to release the chuck, substantially asdescribed.

6. The combination of a tubular spindle, a chuckfbar therein, a collarsliding on said spindle and a second one sliding on the first, leversacting on the chuck-bar and actuated by a tapered portion On the firstcollar, a spring between the two collars, a second spring within thetubular spindle acting between one end of the spindle and the chuckban,whereby said bar is forced forward when it is released by the levers.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN VILSON BROWN, JR.

Witnesses:

WILL. A. BARR,

J os. H. KLEIN,

